I would have said "Add other users as CC", but that's an "Action" in the list above :-). I don't see any showstoppers; missing in general: Comfort with what I'm used to. The UI feels a bit noisy. Also, I find it very confusing that things like the bug tracker have their own names (apparently "Maniphest"). I'm sure names like "Differential", "Diffusion" (Quick quiz: Don't look it up! What's what?), or "Diviner" have a meaning to their developers, but these feel like bumps in the road for the rest.

What's not missing, but what certainly would be nice: Credentials shared with wikitech (for the common users).

All tasks created related to the Bugzilla vs Phabricator discussion are listed as dependencies for documentation purposes (they are not actual blockers of this task). If you find another task, just add it.

@Aklapper: Thanks. Provided that what I just did works, it's a tad complicated (= a "subscribe" button for a project that creates the rule automatically would be nice), but clearly superior to Bugzilla where none of this could be configured by the user.

Removed some recently added "blocking tasks". Task topic says features Bugzilla users would miss. I don't consider the naming of a button or functionality that wasn't available in Bugzilla "missing features".